Represents constant OverlayBaseClasses.
OverlayBaseClasses
OverlayBaseClasses: array[TIWCGJsPlumbOverlayType] of TIWCGJsPlumbOverlayBaseClass = (TIWCGJsPlumbOverlayArrow,TIWCGJsPlumbOverlayLabel,TIWCGJsPlumbOverlayPlainArrow,TIWCGJsPlumbOverlayDiamond,TIWCGJsPlumbOverlayCustom);